FRIDAY, JUNE 26, 2026
gccrs
gccrs: intrinsic: Add arith_offset
gccrs implements the `arith_offset` intrinsic for pointer arithmetic.
The arith_offset compiler intrinsic has been implemented in gccrs. This intrinsic allows for moving a pointer forward or backward by a specified number of elements without causing undefined behavior if the pointer goes out of bounds. It has been added to the handler map and type checking rules.
In Details
The arith_offset_handler function is new in rust-intrinsic-handlers.cc, mapping to the ARITH_OFFSET intrinsic value in rust-intrinsic-values.h. The intrinsic rule is added in rust-hir-type-check-intrinsic.cc, and the handler is registered in generic_intrinsics within rust-compile-intrinsic.cc. This intrinsic provides a safe way to perform pointer arithmetic on element counts.
For Context
- intrinsic
- A special function or operation that has a direct mapping to a specific machine instruction or a highly optimized compiler operation. Compiler intrinsics provide low-level control or performance benefits.
- pointer arithmetic
- Performing arithmetic operations (addition, subtraction) on memory addresses (pointers). In Rust, this is often done indirectly through safe abstractions, but intrinsics can expose lower-level operations.